a= initial sound= 90 decibels
It decreases 9.8% per second. 9.8%=0.098
Sp after 1 second sound is (1-0.098)=0.902 times of the previous bell.
Answer(a): a=90 and b=0.902
when it strucks till 8 seconds then 0 <= t <=8.
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A: Take u = 1/x5.
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